Firing arrangement for muffle furnaces



Painted June 5.1928.

r l A 1,672,862 UNITED ISTATES PATENT oFF/ice.

WILLIAM .'r. mais, im., or NEW Yoan, N. Y., AssI'GNon rro man SURFACE com:

BUSTION COMPANY, INCORPORATED, F TOLEDO, OHIO, A CORPORATION NEW Yoan.

l HIRING @RANGEMENT ron.- MUFFLE rUnNAcEs.

Application led September 26, 1927. Serial No. 221,914.

This Vinvention relates to improvements in firing arrangement for furnaces having` two parallel heating chambers inorder that two parallel lines of articles to" befheat treated may be passed through the 'furnace in opposite directions. v

It is an object ofthe invention to provide a ring arrangement vfor furnaces of the type indicated such as will enable the heating vchambers to be in the form of muil-les, and which will enable gas burners to be employed for heating purposes. Practical considerations limit the use of side onlg the ten burners to one of each mutlie and asa consequence ency has been for one slde of the .mulile to become more highly heated than the other. My firing arrangement overcomes thisv objection and enables uniform heatling on all sides of the muiile to be obtained. In accordanceA with the present invention, gas burners are positioned to fire" a series of through vthe outside walls of the furnace into combustion chambers below the individual mules, and means are provided for equalizing theamo'unt of hot gases which flow lu wardly along the muile side wallsl 4Sald' means preferably takes the form of a perforated partition arranged in the combustion chamber and towards which the burn- `reaching the partition wall Awill .ing fuel is directed. Theburning. gasesl on in part pass through the vpartition and How upwardly along the farside of the muiile, the balance of the gases flowing back toward the burner and upwardly along the near side of the mule.

For a further understanding of the invention, reference ismade to the detailed description taken in connection with the accompanying drawings forming part of this specification, Y

Referring to the drawing, Fig. 1 is a vertical transverse section through the furnace, showing my invention applied thereto. Fig. 2 is a horizontal transversesection taken on line 2 2 of Fig. 1. Fig. 3 is a plan view showing more or-less diagrammatically the type of furnace in connection with which the present invention has been designed for use..

In the drawing, 10 and 12 indlcate, respectively, two heatlng chambers o-f the muiile type, these chambers extending' in arallel` -re ation throughout the length of t e furnace, generally indicatedy at 14 in Fig. 3.

The adjacent sides of the muiles are 'separated from each otherlby a division or lparty wall l'forming part of the furnace construction.

Gaseous fuel is introduced through the side walls.2 l and 26, respectively, of the furnace by means of burners generally indicated at 28 and 30 suitably positioned in the furnace -side walls. These burners are so positioned that the burning fuel is entered into the combustion chambers below the' bottorn of the muiles and consequently tends to se l flow toward the division wall 16 between the muilles. -In order to divert some of the burning gases upwardly into the space between the wall in which the burners are ositioned and the adjacent side wall of t e mule, there is provided 'between the bottom of the muliie and the floor of the combustion chamber, a baille or partition 32 having erforaltions 34 therein through which the urning balance of the gases will flow back towards the burners and up into the space alongside the outer or opposite wall of the mules. By this relatively simple arrangement', burning gases from the burners are caused to flow uniformly up along sides of the muille with the'result that the mullle is uniformly heated throughout. v

Each burner preferably fires into an individual combustlonspace formed between parallel walls 36 poslti'oned transversely of thexmuflle chambers as clearly indicated in Fig. 2. A series of upright spaced baies 37 are provided-in the muflle sidewall spaces,

the-spaces between the bailies forming passages up which the hotgases from the combustion chamber must flow before they may flow longitudinally of the muflestoward the exit ue not shown.l By this means'the heat` ing gases from' the burners are confined to localized areas of the niuflies and thus enabling better control of the heating operation to be obtained. A

I As previously indicated, the work will be rial to be heated is'placed on the conveyer. at

each' end thereof.-

shown in Fig, 3, there '.isa loading'pointat A.`to thc left and a' loading point vat .Blto the right. Opposite these points at the same end, is a correspond-- ing unloading'point. f

The operation of, the furnace -iscontn'iuous and theconveyer ismoving constantly. The. conveying system forms no part of the present invention, the system being substantially the same as that disclosed-.1n Patent runs' ofthe conveyer are confined to suitable tracks generally indicated at 46 1n Fig. 1,-

and depending through slots inthe roof of the furnace aresuitable carrier elements 4 8 from which the ."work to'be treated is suspended in any suitable manner..

1. The combination with a furnace chamber havingv a 4muffle therein fthe sides and bottom of which are disposed in spaced relationA with vrespect to .'thesides and ,bottom of said chamber, of means for heating the inutile comprising fuel-burning means adapted to direct'the burning fuel from one side of said chamber'toward the opposite sidel thereof below the bottom of the muie whereby the burning fueljtends to enter theA space between the mufle and chamber side wall most remote fromV s aid fuelfbur'ning means, and means interposedin the normal path of flowof the burning fuel for restricting the area of entry of the'burning fuel into said space. 'i

2. The comb'naticiwii' afurnace chamber having a mule therein the sides and bottom f which are disposed in spaced relation with respect to the sides and bottom of said chamber, of means for heating the muflle comprising fuel-burnin mea'is adapted to direct the'burning fuel rom one side of saidchamber toward-the opposite side thereof below the bottom of the muiile whereby ,the burning fuel tends to lenter the Aspace between the munie and chamberside wall'most remote from said fuel-burning means, andl a perforated bale interposed in the normal path of flow of the bi'rning fuel for restricting the area of entry of the burning fuel vinto said space.

3. The combination with a pair of furnace chambers arranged side by side with a vertical division wall between' them and each chamber having a muflie therein the lsides andlbottom of which are disposed in spaced relation with respect to the sides and bottom of their respective chambers, of

means forheating the munies comprising for each chamber fuel-burning means adapted to direct the burning fuel from points along theputside walls of the furnace towardthat portion of the division wall extending below the bottom of said muflles whereby the burning fuel tends to enter the space between said wall and the adjacent side of the muffle, and 4 means interposed in the normal path of flowiof theburning fuelfor restricting the area of entry of the burning fuel into said spaces.

4. The combination with a .pair of'furnace chambersarranged sideby side With avertical division wall between them and each chamber having a muiiie therein 'th.e fsides and bottom of which are disposed in spaced relation with respect to the sides and bottom of their respective chambers,of means for heating the muiiies comprising foreach chamber fuel-burning means adapted to,di-

rect the burning-fuel from points alongthe outside walls of the Afurnace toward thatv portion of the division -wall extending below the' bottom of said muifles whereby7 the burn- 'ing fuel tends to enter the space between said wall and the adjacent iside of the' muffle, and a perforated baffle interposed in the normal path of flow of the burning fuel for restricting the area of entry of the burning fuel into saidspaces.

.5. The combination witha furnace chain- 4 ber having a 'milifle therein the sides and bottom of which are disposed in snaced rela-y tion with respect to the sides and bottom of sald chamber, of transversely extending par# titions dividing the space ,between the bot- Atom of the muiiie and chamber into channels,

fuel-burning means Yfiring into said channels from one end thereof, and vmeans extending across said channels adjacent the other` end thereof for limiting the amount ofburning fuel that may pass intothe space between the ad]a cent inutile side wall and chamber wall.

6. vIn combination a furnace chamber, ya l muftle within the chamber, means for introducing heating gases below the munie infa direction transverse to the length thereof and means for diverting a portion of the heating gases back to theside Wall nearest said means.

-7. In combination, a -longitudinally ex- 'i tending furnace chamber having Aa munie therein, a series of upright baies between the side walls of the muile and furnace chamber, a preferated baflie extending longitudinally of said chamber below the munie I and ositivoned nearer one side wall of the cham r than the other, and a series of burners firing through that furnace`side wall most remote from said perforated baie. t

In testimony whereof'I aix my signature.

WILLIAM J. HARRIS, JR. 

